Well I absolutely KNOW that the moon affects some people. My husband has suffered from schizophrenia for over 25 years & like most patients, his symptoms wax & wane.
Though well controlled by Clozaril, his agitation usually increases as the moon reaches full status, particulary so at the moon's quarter.
As previously mentioned the word lunatic is derived from the observations of the mentaly ill in hospital & I know Staff & Doctors have a lot more trouble with patients on the wards at these times.
We can appreciate the funny side of the illness at times & have an inspection of his palms & teeth which often produces some hilarious reactions from friends!